Fibre cuts impacted several countries (in particular Bulgaria, Turkey and Iran) in the early morning on December 19th 2019 according to https://www.bbc.com/news/technology-50851420?ns_mchannel=social&ocid=socialflow_facebook&ns_campaign=bbcnews&ns_source=facebook&fbclid=IwAR3O_v7SeQw1buUkMW4vB7iFDLecMV6FIR5DXOEmdbx1VrPpfjw2my_6ZMo. According to the BBC the issue lasted for about 2 hours on Thursday (2019/12/19) morning. Another report from Netblocks also identifies the problem as during the hours of 7am and 8am December 19, 2019
Iran
Looking at the 7 hosts in Iran (see https://www.slac.stanford.edu/cgi-bin/pingtable.pl?file=packet_loss&by=by-node&size=100&tick=hourly&year=2019&month=12&day=19&from=EDU.SLAC.STANFORD.PINGER&to=Turkey&ex=none&only=all&ipv=all&dataset=hep&percentage=any) that are monitored from SLAC we see in the spreadsheet a peak aggregate packet loss for the hours of 7 and 8pm GMT.
Bulgaria
One of the 4 hosts in Bulgaria exhibited a bug packet loss of 16% in the hour 8:00-8:59am GMT. The others saw no loss.
The database for the host gives us:
NODENAME: www.varna.bg IPADDRESS: 91.230.192.53 SITENAME: varna.bg NICKNAME: BG.VARNA.WWW FULLNAME: Varna Municipality LOCATION: Varna COUNTRY: Bulgaria CONTINENT: Balkans LATANDLONG: 43.2012 27.9148 PROJECTTYPE: NOT-SET PINGSERVER: NOT-SET TRACESERVER: NOT-SET DATASERVER: NOT-SET URL: http://www.varna.bg/ CONTACTS: Google COMMENTS: Add by Cottrell 8/5/2019.
Turkey
For the three hosts in Turkey that are monitored from SLAC there was no evidence of packet loss in the morning of Thursday 12/19/2019.